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18650 Tank Top Deck
The 130 x 74 x 3 mm lid and battery deck for the 'N20 Twin-Track Mini Tank Chassis' kit. It bolts to the Tank Hull Tub's heat-set corner bosses with four M3x8 SHCS through 3.4 mm holes at ±58/±30 mm. The rear half has two 18.8 x 67 mm open troughs with 12 mm walls for 2x 18650 cells, plus 3 x 22 mm slots for a hook-and-loop strap and lead-wire notches. The front half has a 10 mm grid of 3.4 mm M3 holes for motor-driver and MCU standoffs, and a 20 x 8 mm slot passes the wiring into the hull.
Flagged: battery or DC power. Not for safety-critical use without independent engineering review.
Twin N20 Motor Clamp Bar
A 30 x 49 x 5 mm clamp bar from the 'N20 Twin-Track Mini Tank Chassis' kit. It lies across the tops of both 12 x 10 mm N20 gearmotors and pulls them down into the Tank Hull Tub cradle with four M3x8 SHCS (3.4 mm holes at ±11/±20 mm) screwed into the hull's heat-set posts. Two 1.5 mm locating lips straddle the 12 mm motor bodies with 0.4 mm clearance, and a 10 mm notch passes the motor wires.
Tank Hull Tub
The 130 x 74 x 36 mm open-top hull for the 'N20 Twin-Track Mini Tank Chassis' kit. It has a supportless cradle for two coaxial N20 gearmotors, 7 x 10 mm stadium slots for the shaft exits, and 4.5 mm slots for tensioning the M4 idler axles. Other features are 3.4 mm M3 holes for the skid rails and eight 8 mm bosses with 4.0 mm bores for M3 heat-set inserts, which hold the motor clamp bar and the 18650 top deck.